title: Distributions, possible sources and biological risk of DDTs, HCHs and chlordanes in sediments of Beibu Gulf and its tributary rivers, China.
abstract: Thirty-five surface sediment samples collected from Beibu Gulf and its tributary rivers, China were analyzed for DDTs, HCHs and chlordanes. Total concentrations of DDTs, HCHs and chlordanes in sediments ranged from 0.59 to 126 ng g(-)(1), ND to 2.65 ng g(-)(1) and 0.27 to 3.41 ng g(-)(1) based on dry weight (dw), respectively. Concentrations of DDTs were higher than those reported in the sediments from other regions of the world, while concentrations of HCHs and chlordanes were relatively low. High concentrations of DDTs were observed in the harbor region and aquaculture bases and high concentrations of HCHs were found in the Qin River Estuary. The ratios of (DDE+DDD)/DDTs reflected a mixed input of weathered and fresh DDTs. The predominant β-HCH indicated that HCHs in the study area mainly originated from the historical usage of technical HCH. The residues of DDTs would pose adverse biological effects on the study area.
authors.affiliation: School of Environment Studies, Guangxi University, Nanning 530004, China.
authors.forename: Yiyin
authors.initials: Y
authors.lastname: Xu
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.forename: Ruijie
authors.initials: R
authors.lastname: Zhang
authors.forename: Songjun
authors.initials: S
authors.lastname: Guo
authors.forename: Wenyu
authors.initials: W
authors.lastname: Huang
authors.forename: Gan
authors.initials: G
authors.lastname: Zhang
mesh_terms: D002681:China; D002706:Chlordan / Q000737:chemistry*; D003634:DDT / Q000032:analysis*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006581:Hexachlorobenzene / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D002706:Chlordan; D006581:Hexachlorobenzene; D003634:DDT
keywords: Beibu Gulf; China; Chlordane; DDT; HCH; Sediments